Expansion-bolt.



No. 784,845. PATENTED MAR. 14, 1905.

F. H. EVANS. 1

EXPANSION BOLT.

APPLICATION FILED NOV. 11. 1904.

EEEEEEEEEEEEE 1.

WITNESSES: llVl/ENTOR I No. 784,845. PATENTED MAR. 14, 1905.

F. H. EVANS. EXPANSION BOLT.

APPLIGATION FILED NOV. 11. 1904 3 SHEETS-SHEET 2.

ATTORNEYS No. 784,845. PATENTED MAR. 14,1905.

F. H. EVANS.

EXPANSION BOLT.

APPLICATION FILED NOV. 11. 1904.

3 SHEETS-SHEET 3.

WlT/VESSES: I 3* N I/Vl/E/VTOR Evian Hz c Vans UNITED STATES PatentedMaren 14, 1905.

FREDERIC H. EVANS, OF NEXV YORK, N. Y.

EXPANSION-BOLT.

srEcmIcATIoN forming part of Letters Patent No. 784,845, dated March14., 1905.

Application filed November 11,1904. Serial No. 232,281. V

To 11]] whom it may concern:

Be it known that I, FREDERIC H. EvANs, a citizen of the United States,and a resident of the city of New York, borough of Brooklyn, in thecounty of Kings and State of New York, have invented a new and ImprovedExpansion- Bolt, of which the following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improvedexpansion-bolt composed of comparatively few parts held together whennot in use without separate fastening devices and arranged to insure alirm engagement and embedding or gripping of the expanding devices inthe wood, stone, or other material on which the expansion-bolt is used.

The invention consists of novel features and parts and combinations ofthe same, as will be more fully described hereinafter and then pointedout in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a side elevation of the improvementin position on the partsto be fastened together, the expanding devices being retracted ornon-expanded and the parts to be 'fastened together being shown insection.

Fig. 2 is a longitudinal sectional elevation of the same on the line 2 2of Fig. 1. Fig. 3 is a like view of the same, showing the expandingdevices expanded, the section being on the line 3 3 of Fig. 4. Fig. 4 isa side elevation of the same. Fig. 5 is a sectional side elevation ofthe same on the line 5 5 of Fig. 4. Fig. 6 is a cross-section of theimprovement on the line 6 6 of Fig. 1. Fig. '7 is a side elevation of amodilied form of the improvement in position on the parts fastenedtogether, said parts being shown in section. Fig. 8 is a longitudinalsectional elevation of the same on the line 8 8 of Fig. 7, and Fig. 9 isa transverse section of the same on the line 9 9 of Fig. 7.

The expansion-bolt illustrated in Figs. 1 to I 4, inclusive, consists ofa bolt A and expanding members B and C, made tubular in shape and ofwhich the member B is provided with an interior screw l thread engagedby the threads of the bolt A, while the other member, C, is loosely heldon the bolt between the member B and the head of the bolt A. Each of themembers B and C is provided with integral longitudinally-extending jawsor arms B and C, respectively, arranged alternately in a transversedirection, as plainly indicated in the drawings, the free ends of thejaws B being adapted to travel up bevels or inclines, C" on the member Cand the free ends of the jaws or arms 0 being adapted to travel up oninclines B formed on the peripheral face of the member B. \Vhen theexpansion-bolt is placed in the bore D of a part D, to which anotherpart, E, is to be attached, and the operator turns the head of the boltA, then the member B is caused to move toward the other member, C, whichlatter abuts with its outer face against the part E, as indicated in thedrawings. In case the device is used in very deep bores a washer orsleeve is placed on the bolt between the part E and the outermost member0. When the member B travels toward the member 0, the jaws or arms B andC are expanded outwardly, so as to lirmlyengage and practically embedthemselves at their free ends in the material of the part I), as plainlyindicated in Fig. 3, to lirmly hold the expansion-bolt in positionagainst pulling out of the bore 1). It is understood that thejaws orarms B and C are preferably somewhat reduced in thickness at or neartheir junction with the tubular members B and C to permit the said jawsor arms B and (I to readily bend in an outward direction for engagingthe interior surface of the bore D when moving the threaded member Btoward the abutting member C.

From the foregoing it will be seen that each of the members B and U isprovided with expanding devices expanded by the other member whenturning the bolt for drawing one member toward the other. Thus two setsof grippingdevices are moved in engagement with the wall of the bore toinsure an exceedingly-firm fastening of the expansion-bolt, especiallyas the free ends of the expanding jaws or arms are capable of embeddingthemselves in or gripping the material of the part D.

The free ends of the jaws or arms B and C are preferably somewhatbeveled to readily slide up on the corresponding inclines C and B of theopposite members.

In the modified form illustrated in Figs. 7, 8, and 9 the jaws or arms Band C" of the members B and 0, held on the bolt A, are beveled ortapering at their sides, and the opposite sides of adjacent jaws or armsare in contact with each other, as plainly indicated in Fig. 7. Now whenthe bolt A is turned and the member B advances toward the other member,C, then the jaws of one member act on the jaws of the other member toforce the same outward-that is, both sets of jaws are expanded to engagethe wall of the bore D of the part 1), to which the other part, E, is tobe fastened by the expansion-bolt.

From the foregoing it will be seen that when the device is not in usethe two members are held on the boltA without requiring separatefastening devices, and in order to use the expansion-bolt it is onlynecessary to place it into the bore of one part and turn the bolt tocause the threaded member of the expanding device to move toward theother member in order to force the jaws of both members simultaneouslyoutward in firm engagement with the wall of the bore, as aboveexplained.

ll aving thus described my invention, Iclaim as new and desire to seeure by Letters Patent 1. An expansion-bolt, comprising a bolt, andexpanding members, movable relatively to one another along the bolt andhaving laterally-movable jaws, and means arranged to contact with theunder side of the jaws and move them outward when the said membersapproach each other.

2. An expansion-bolt, comprising a bolt, and a pail-of members sleevedon the bolt, each a member having laterally-movable portions armember,whereby the jaws will be bent out? ward and their ends embedded in thewall of the bore of the part in which the bolt is arranged on drawingthe threaded member toward the other member.

t. An expansion-bolt, comprising a bolt, and an expanding device on saidbolt and consisting of a threaded member in which screws the bolt and anabutting member loose on the bolt, the said members having integral jawsextending toward each other, the jaws of each member being reduced inthickness at their junction with the members to permit them to bereadily bent outwa rd and constructed to ride upon the other member whenthe threaded member is drawn toward the abutting member on turning thebolt.

5. An expansion-bolt, comprising a bolt, and members capable ofexpanding and held on the bolt, each member having-a plurality of spacedgripping-jaws, and beveled surfaces be tween the jaws at the basesthereof, one member being screw-threaded to screw on the bolt and theother member being held loosely on the bolt.

6. An expansion-bolt comprising a bolt, and members capable of expandingand held on the said bolt, each member having integral laterally-movablejaws and beveled faces, for the jaws of one member to engage the beveledfaces of the other member, one of the members being threaded to screw onthe bolt and the other member being held loosely on the bolt between thethreaded member and the head of the bolt.

7. An expansion-bolt comprising a bolt, and members capable of expandingand held on the said bolt, each member having integral gripping-jaws andbeveled faces, for the jaws of one member to engage the beveled faces ofthe other member, the said jaws on each member being spaced apart forthe reception of the jaws of the other member.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERIC H. EVANS.

\Vitnesses:

Tnno. G. HOSTER, EVERARD BOLTON MARsHALL.

